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EUVD-2026-318374

fkie_cve-2026-25705

A vulnerability has been identified in [Rancher's Extensions](https://ranchermanager.docs.rancher.com/integrations-in-rancher/rancher-extensions) where malicious code can be injected in Rancher through a path traversal in the `compressedEndpoint` field inside a `UIPlugin` deployment. A malicious UI extension could abuse that to: * Overwrite Rancher binaries or configuration to inject code.

* Write to /var/lib/rancher/ to tamper with cluster state.

* If hostPath volumes are mounted, write to the host node filesystem.

* Use this issue to chain with other attack vectors.

GHSA-5v3h-x4wf-5c35 — Rancher Extensions have arbitrary file access via path traversal

Affected: Go: github.com/rancher/rancher

### Impact

- Overwrite Rancher binaries or configuration to inject code. - Write to `/var/lib/rancher/` to tamper with cluster state. - If `hostPath` volumes are mounted, write to the host node filesystem. - Use this issue to chain with other attack vectors.

By default only the administrator can deploy UI extensions, unless permissions are granted to other users. It's always recommended to only install extensions that come from sources trusted by the user.

Please consult the associated [MITRE CAPEC-126 - Technique - Path Traversal](https://capec.mitre.org/data/definitions/126.html) for further information about this category of attack.

### Patches

This vulnerability is addressed by ensuring that:

- The file defined by the UI Plugin CR's `compressedEndpoint` has to be created inside the cache directory and cannot contain `../`. If that is not possible, the installation will fail and the file won't be created. - The icons referenced by Cluster Repos' `index.yaml` file always resolves to a file inside the repository directory.

Patched versions of Rancher include releases v2.14.1, v2.13.5, v2.12.9, v2.11.13.

### Workarounds

There is no workar…

WID-SEC-W-2026-1347 — Rancher: Schwachstelle ermöglicht Codeausführung und Manipulation von Dateien

Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Rancher ausnutzen, um beliebigen Programmcode auszuführen, und um Dateien zu manipulieren.